Review of Repellency Treatments

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Authors
  1. Grozea, C.M.
Corporate Authors
Defence Research and Development Canada, Suffield Research Centre, Ralston AB (CAN);Royal Military Coll of Canada, Kingston ONT (CAN) Dept of Civil Engineering
Abstract
Liquid repellent coatings have become frequently used in many sectors due to their ability to repel a broad range of liquids ranging from high surface tension liquids such as water to low surface tension oils. They are used in the military textile field as the outer layer finish of chemical and biological personal protection equipment such as air permeable coveralls. These finishes can help protect personnel not only from warfare agents, but also from everyday substances such as water, oils, fuel, lubricants, cleaning solvents, and other contaminants. Traditionally, long chain C8 fluorochemical-based finishes were used to achieve this protection; however, due to their potential high toxicity, legislation has been put in place to restrict or ban their usage throughout the world. Alternative coatings have been developed and brought to market. Coatings at all technology readiness levels are summarized and compared in this report. In particular, short chain C6 fluorochemical coatings have come close in performance to traditional coatings without the high environmental risk. Other alternative more benign coatings such as silicone and hydrocarbon based finishes have only shown water repellency properties and no oil repellency to date. Additionally, test methods used to evaluate these coatings, ranging from standard test methods to university laboratory developed tests, are discussed and evaluated.

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Keywords
Fabric Treatment;Liquid Repellency
Report Number
DRDC-RDDC-2018-C227 — Contract Report
Date of publication
01 Nov 2018
Number of Pages
100
DSTKIM No
CA048062
CANDIS No
808749
Format(s):
Electronic Document(PDF)

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